Astronomers have discovered a planet in the Milky Way galaxy that has three suns. It's weird enough trying to imagine three suns in the sky at once. Scientists are having a hard time explaining how such a planet could exist in the first place.

Planet-watchers, take note. A rare event is coming to the sky next week. On Tuesday, June 8, Venus will cross in front of the sun for the first time since 1882, as seen from Earth. But don't try to watch it with your unprotected eyes.

It's a good thing we can't get anywhere near a black hole. If it were possible, the consequences would not be pretty. A black hole is a point in space where gravity is so intense that not even light can escape its tremendous grip.

Imagine cramming hundreds of thousands of bright, young stars into a space no bigger than our solar system. Talk about a traffic jam! Astronomers have observed such "super" star clusters, but only in galaxies far, far away—until now.

The sun is a strange and turbulent place. The scorching hot ball of gas may look smooth from a safe distance, but dark spots, violent explosions, and massive eruptions constantly come and go on its surface.

Visiting a mysterious, alien world is usually just the stuff of dreams or science fiction stories. For many scientists around the world, the dream came true last month when a space probe touched down for the first time on the surface of Saturn's moon